<template>
  <Table
    v-if="summaryFunc || summaryData"
    :showHeader="false"
    :bordered="false"
    :pagination="false"
    :dataSource="getDataSource"
    :rowKey="(r) => r[rowKey]"
    :columns="getColumns"
    tableLayout="fixed"
    :scroll="scroll"
  />
</template>
<script lang="ts">
  import type { PropType } from 'vue'
  import { defineComponent, unref, computed, toRaw } from 'vue'
  import { Table } from 'ant-design-vue'
  import { cloneDeep } from 'lodash-es'
  import { isFunction } from '/@/utils/is'
  import type { BasicColumn } from '../types/table'
  import { INDEX_COLUMN_FLAG } from '../const'
  import { propTypes } from '/@/utils/propTypes'
  import { useTableContext } from '../hooks/useTableContext'

  const SUMMARY_ROW_KEY = '_row'
  const SUMMARY_INDEX_KEY = '_index'
  export default defineComponent({
    name: 'BasicTableFooter',
    components: { Table },
    props: {
      summaryFunc: {
        type: Function as PropType<Fn>,
      },
      summaryData: {
        type: Array as PropType<Recordable[]>,
      },
      scroll: {
        type: Object as PropType<Recordable>,
      },
      rowKey: propTypes.string.def('key'),
    },
    setup(props) {
      const table = useTableContext()

      const getDataSource = computed((): Recordable[] => {
        const { summaryFunc, summaryData } = props
        if (summaryData?.length) {
          summaryData.forEach((item, i) => (item[props.rowKey] = `${i}`))
          return summaryData
        }
        if (!isFunction(summaryFunc)) {
          return []
        }
        let dataSource = toRaw(unref(table.getDataSource()))
        dataSource = summaryFunc(dataSource)
        dataSource.forEach((item, i) => {
          item[props.rowKey] = `${i}`
        })
        return dataSource
      })

      const getColumns = computed(() => {
        const dataSource = unref(getDataSource)
        const columns: BasicColumn[] = cloneDeep(table.getColumns())
        const index = columns.findIndex((item) => item.flag === INDEX_COLUMN_FLAG)
        const hasRowSummary = dataSource.some((item) => Reflect.has(item, SUMMARY_ROW_KEY))
        const hasIndexSummary = dataSource.some((item) => Reflect.has(item, SUMMARY_INDEX_KEY))

        if (index !== -1) {
          if (hasIndexSummary) {
            columns[index].customRender = ({ record }) => record[SUMMARY_INDEX_KEY]
            columns[index].ellipsis = false
          } else {
            Reflect.deleteProperty(columns[index], 'customRender')
          }
        }

        if (table.getRowSelection() && hasRowSummary) {
          const isFixed = columns.some((col) => col.fixed === 'left')
          columns.unshift({
            width: 60,
            title: 'selection',
            key: 'selectionKey',
            align: 'center',
            ...(isFixed ? { fixed: 'left' } : {}),
            customRender: ({ record }) => record[SUMMARY_ROW_KEY],
          })
        }
        return columns
      })
      return { getColumns, getDataSource }
    },
  })
</script>
